Increasing the margin ratio before the long holiday is a legal requirement and a risk prevention, with the aim of resolving the cash flow risk contained in the long holiday.

"Business Rules for Stock Index Futures Simulation Trading of China Financial Futures Exchange" Article 60 In the process of futures contract trading, the exchange may adjust its trading margin level according to market risks: (1) There are continuous price limits in the same direction; (two) in case of national holidays; (3) The Exchange believes that the market risk has increased significantly. (4) Other circumstances deemed necessary by the Exchange.